reading bridge values from kernel

anuqan · 03-29-2004, 10:34 PM

Hi!
I am using my Linux Box as a bridge. I use brctl to configure it. It is working fine. brctl showmacs br0 shows the list of Mac Addresses the bridge knows about. Now I want to read the values directly by opening a file etc in a routine. i.e I need to know where brctl gets the values from so that I can also get them from there directly.
Could anyone please help... its urgent
Thanks
Anupama

leckie · 03-30-2004, 12:33 AM

well for startes you can simply redirect the output from brctl into the script it's self, this is probably a more ideal solution then reading it from a file.
I also have no idea where it stores the data, but have a good look through /proc/ and also iptables, or chains depending on what you use. The data how ever is stored in what is called a Forwarding DataBase (fdb), try looking this up and see what you find.

anuqan · 03-30-2004, 01:08 AM

thanks for the prompt reply. I was going thru the source code of brctl - you are right about forwarding tables - it all boils to an ioctl call and I am not too familiar with ioctl - am now doing some study on that

159ww · 04-14-2004, 06:18 PM

Hi,

I have a quick question about brctl. I want to directly access the MAC address to physical interface mapping of the bridge - where is this stored internally? I dont want to use brctl show/showmacs.
Please shed some light on how to do this
Thanks!